Raiser structure for stapling machines



April 19, 1955 o. MOEN RAISER STRUCTURE FOR STAPLING MACHINES Filed Aug.6, 1952 INVENTOR. 0770 MOFA/ BY @MMZM United States Patent RAISERSTRUCTURE FOR STAPLING MACHINES Otto Moen, Oslo, Norway ApplicationAugust 6, 1952, Serial No. 302,889 Claims priority, application NorwayAugust 9, 1951 8 Claims. (Cl. 1-3) The present invention relates tostapling machines of the type in which a staple magazine and plunger arepivotally supported on a base. In particular, the invention is directedtoward resilient structure for swinging the magazine and plunger upwardrelative to the base about the interconnecting pivot after a staplesetting operation has been completed.

A stapling operation is accomplished in the usual way by applyingpressure to a knob at the swinging end of the magazine, the initialeffect of which is to swing the staple magazine downward into engagementwith the work and thereafter the plunger moves downward relative to thestaple magazine to force a staple through the work and clinch its freeends against an anvil. Downward swinging of the staple magazine isresiliently resisted by spring mechanism which serves to return thestaple magazine to its upwardly swung position again when pressure onthe knob is released following the stapling operation.

The principal object of the present invention is to provide a simplerand more effective type of resilient mechanism for returning the staplemagazine to its upper position and arresting such upward movement in thedesired position of rest. In the present device the staple magazine notonly is arrested in its desired upper position, but is held resilientlyin such upper position against movement by the force of gravity if thestapling machine is turned upside down.

A further object is to provide such staple magazine arresting andresilient holding mechanism which will not excessively resist movementof the staple magazine rela tive to the base either during a staplingoperation or when the staple magazine is intentionally swung away fromthe base for application of staples without clinching them against thebase anvil.

In accomplishing the aforementioned objects a spring is positioned toreact between the base and a plate element which engages the portion ofthe staple magazine adjacent to the base for a considerable extentgenerally parallel to the base. The spring acting substantially at themiddle of such plate element exerts a force substantially perpendicularto such plate element and the base and thereby tends to move the plateelement through positions parallel to the base and urge it in suchattitude against the staple magazine, so that in turn the portion of thestaple magazine engaged assumes a position parallel to the base.

A preferred type of mechanism embodying the present invention isillustrated in the accompanying drawings.

Figure 1 is a side elevation view of a stapling machine incorporatingthe present invention with parts broken away.

Figure 2 is a fragmentary plan view of the staple magazine supportingend portion of the base, the staple magazine being removed.

Figure 3 is a fragmentary longitudinal sectional view through the staplemagazine supporting end portion of the base and the adjacent portion ofthe staple magazine attached thereto, with the staple magazine swunginto a position extending transversely of the base.

On the upper side at one end the base plate 1 carries flanges projectingupward from it in spaced parallel rela tionship which may be formed bythe opposite sides of a U-shaped bracket 2 having its web portionsuitably secured to the base. Between these flanges extends the pivotpin 3 on which the elongated staple magazine, having one end receivedbetween such flanges, is mounted. The end of the staple magazine remotefrom pivot 3 carries the 2,706,292 Patented Apr. 19, 1955staple-applying plunger 14, reciprocable downward by pressure on theknob 15.

In the absence of any movement limiting or restraining mechanism, thestaple magazine 4 would be swingable relative to the elongated base 1about pivot 3 through at least It is desirable for the staple magazineand the base normally to lie in generally parallel relationshipalongside each other, spaced apart sufficiently for work to be stapledto be received between the plunger 14 and a clinching anvil 16 on theend of base 1 remote from the bracket 2 and in a position registeringwith the plunger 14. The mechanism of the present invention foraccomplishing such normal disposition of the staple magazine relative tothe base includes the raiser received between the flanges of bracket 2and including a plate portion 5 preferably of a width approaching thespacing between such flanges. This plate portion may be stiffenedlengthwise of the staple magazine and base by downturned flanges 5'formed on opposite edges of the plate portion and disposed alongside thebase flanges, respectively, to locate the raiser relative to such baseflanges.

The plate portion 5 of the raiser which bears against the lower portionof the staple magazine 4 extends from the rearward end of such magazineapproximately to the front end of bracket 2, so that the plate portionof the raiser extends to both sides of a plane through the axis of thepivot pin 3 which plane is perpendicular to the base 1, the major partof the length of such raiser plate portion being positioned forward ofsuch plane, that is, toward the plunger 14 and anvil 16 from the pivot,and the minor part of the length of such raiser plate portion beingpositioned rearward of such plane, that is, at the side of pivot pin 3remote from the plunger 14 and anvil 16. At the front end of the plateportion, namely that adjacent to the anvil 16, an angle portion 5" ofthe raiser extends downwardly from such major plate portion toward thebase and its lower end passes through a slot 6 in the base, the lengthof which extendstransversely of the base. The lower end of such raiserangle portion has an aperture 7 receiving the rear end of a leaf spring8 extending lengthwise of the base and secured beneath its uppersurface, as shown in Figures 1 and 3. The front end of such leaf springmay hold the anvil 16 in the desired operating position.

The plate portion 5 of the raiser is pressed into engagement with thelower edge of the staple magazine 4 by a helical spring 9 reactingbetween the base 1 and approximately the central part of the plateportion 5 of the raiser. In order to hold the spring 9 in positioninterengaged between the base and raiser a collar 10 is presseddownwardly out of the material of the plate portion 5, of a size to fitwithin the end of the spring. To locate the other end of the spring apin 11 extending within it is mounted on the central portion of theU-shaped bracket 2.

In the position shown in Figure l the plate portion 5 of the raiserpressed against the portion of the staple magazine 4 which is adjacentto the base 1, normally holds such magazine in a position substantiallyparallel to the base 1 as illustrated. Upward movement of the rear endof the raiser is limited by pressure of the raiser against the portionof the staple magazine immediately beneath pivot pin 3. Upward movementof the forward end of the raiser effected by spring 9 is limited byengagement of the lower edge of slot 7 with spring 8, upward movement ofwhich in turn is limited by engagement of such spring with the underside of the base 1. The length of the angle portion 5" between the loweredge of the slot 7 and the surface of the plate portion 5 engaging thestaple magazine is such relative to the spacing between the portion ofthe staple magazine adjacent to the base at the location of pivot pin 3and the base as to dispose the staple magazine 4 in any desired relationto the base 1. Preferably such length of the angle portion of the raisermentioned is equal to the spacing between such portion of the staplemagazine and the base also mentioned, so that upward movement of theraiser will be arrested with its plate portion 5 disposed in a planeparallel to the base 1. If the portion of the staple magazine 4 engagedby this raiser portion is parallel to the remainder of the under surfaceof the staple magazine, such magazine will therefore be held in aposition surface is parallel to the base 1.

Because the plate portion of the raiser extends to both sides of avertical plane through the pivot axis of the staple magazine 4 definedby the pin 3, the raiser serves the further purpose of resistingmovement of the staple magazine away from the base when the staplingmachine is lifted and transported by the magazine or the knob 15. Whenthe stapling machine is thus held, the force of gravity acting on thebase 1 tends to swing its anvil end downward relative to the staplemagazine, but such movement would require deflection of the rear end ofthe base relative to the part of the raiser plate portion 5 and staplemagazine rearwardly of the pivot pin and a consequent withdrawal of theforward portion of such raiser from contact with the adjacent edge ofthe staple magazine; Such movement would compress spring 9 somewhat, sothat the spring resists this movement, and preferably it is stiff enoughso that the weight of the base 1 would not eifect any appreciablemovement of this type.

Despite the action of spring 9 in thus resisting inadvertent angulardisplacement of the base relative to the of rest in which its under 3.In a stapling machine, an elongated base, a pair of flanges projectingfrom one side of said base in spaced parallel relationship, a pinextending between said flanges, an elongated staple magazine disposedsubstantially parallel to said base and having one end pivotally mountedon said pin, a raiser including a plate portion engaging that portion ofsaid staple magazine which is adjacent to said base and said plateportion extending to both sides base has a member projecting from it.into the other end staple magazine, such magazine may readily be swungintentionally away from the base in opposition to the force of spring 9,as indicated in Figure 3. During this movement the rearward end of thestaple magazine is swung about pivot pin 3 into closer proximity to thebase 1, and by such lever action forces toward the base the rearward endof the raiser. As shown in Figure 3, the raiser is tilted about thelower edge of its aperture 7 engaged by the leaf spring 8 and the spring9 is compressed.

The staple magazine includes a spring for holding the staples within itand urging them toward the plunger 14, and the rearward end of thisspring is formed as a loop 12 extending rearwardly beyond the staplemagazine. In order to avoid interference between this spring loop andthe raiser when the staple magazine is swung away from the base 1, therearward portion of the raiser is provided with a notch 13 opening atits rearward end as shown in Figures 1, 2 and 3, to receive such springend loop in the manner illustrated in Figure 3 as it moves toward thebase.

I claim:

1. In a stapling machine, an elongated base, an elongated staplemagazine disposed substantially parallel to said base and having one endpivotally supported from said base, a raiser including a plate portionengaging that portion of said staple magazine which is adjacent to saidbase and said plate portion extending to both sides of that plane inwhich said magazines pivot axis lies and which plane is perpendicular tosaid base, and spring means interengaged between said base and saidraiser and urging said raiser plate portion toward said staple magazine.

2. In a stapling machine, an elongated base, a pair of flangesprojecting from one side of said base in spaced parallel relationship, aan elongated staple magazine disposed substantially parallel to saidbase and having one end pivotally mounted on said pin, a raiserincluding a plate portion engaging that portion of said staple magazinewhich is adjacent to said base, said plate portion having a minor partof its length extending along such magazine portion which is disposed atone side of that plane in which said magazines pivot axis lies and whichplane is perpendicular to said base, and said plate portion having amajor part of its length extending along such magazine portion which isdisposed at the other side of such plane, spring means interengagedbetween said base and said raiser and urging said raiser plate portiontoward said staple magazine, and means interconnecting said base andsaid major part of said raisers plate portion and operable to limitseparating movement of said base and said major part of said raisersplate portion, but permitting movement of said major part of saidraisers plate portion toward said base.

pin extending between said flanges,

of the spring and operable to anchor such other spring end relative tothe base.

5. In a stapling machine, an elongated base, an elongated staplemagazine disposed substantially parallel to said base and having one endpivotally supported from said base, a raiser including a plate portionengaging that portion of said staple magazine which is adjacent to saidbase, spring means interengaged between said base and said raiser andurging said raiser plate portion towards said staple magazine, and saidraiser having an angle portion disposed at an angle to said plateportion and extending therefrom to said base, and means carried by saidbase, engaging said angle portion of said raiser and limiting movementthereof away from said base but permitting movement thereof toward saidbase.

6. In the stapling machine defined in claim 5, the base being aperturedto receive the end of the raisers angle portion remote from the raisersplate portion, the portion of the raisers angle portion received throughsuch base aperture being apertured, and a securing member extendingthrough such raisers angle portion aperture and engageable with the baseto secure the raisers angle portion against withdrawal of its end fromthe base aper ture.

7. In a stapling machine, an elongated base, a pair of flangesprojecting from one side of said base in spaced parallel relationship,an elongated staple magazine disposed substantially parallel to saidbase, received between said flanges, and having one end pivotallysupported by said flanges, a raiser including a plate portion engagingthat portion of said staple magazine which is adjacent to said base,disposed between said flanges, and said raiser having flanges alongopposite edges thereof disposed respectively adjacent to the flanges ofsaid pair of base flanges, respectively, and projecting toward saidbase, and spring means interengaged between said base and said raiserand urging said raiser plate portion toward said staple magazine.

8. In a stapling machine, an elongated base, an elongated staplemagazine disposed substantially parallel to said base, having one endpivotally supported by said base, and having a projection beyond suchpivoted end, a raiser including a plate portion engaging that portion ofsaid staple magazine which is adjacent to said base and having a notchin the end thereof adjacent to said staple magazine projection, openingat such end, and operable to receive said projection as said staplemagazine is swung away from said base, and spring means interengagedbetween said base and said raiser and urging said raiser plate portiontoward said staple magazine.

References Cited in the file of this patent UNITED STATES PATENTS2,087,779 Pankonin July 20, 1937 2,097,865 Stockel Nov. 2, 19372,271,926 Pankonin Feb. 3, 1942 2,277,347 Pankonin Mar. 24, 1942

